Variable "daylight" temperature
I took some photos today with my compact Canon S110 - just snapshots really of the cat basking in the sun! - as Canon CR2 raw files. The white balance on the camera was set to auto. The lighting was tricky and I used fill in flash to counteract the effect of bright sunlight and deep shadows. The "shot" colour temperature of the files varied. I noticed that if I select the "daylight" preset in the white balance tool in C1, the result varies. For example, in a shot where the auto white balance had resulted in a value of 5242 Kelvin, selecting "daylight" changes it to 5182 Kelvin. In another of the shots where auto white balance had produced 5009 Kelvin, selecting daylight in C1 gives me 4980 Kelvin.
I would have expected that for the same camera selecting the same preset in C1 should produce the same colour temperature.
(I realise that what the Canon S110 thinks is the Kelvin value for daylight will not be the same as what my more serious Nikon D7000 uses - and with the D7000, selecting the "daylight preset in C1 always gives the result 5208 Kelvin.)
As a quick experiment just now I set the S110 camera itself to daylight white balance rather than auto. This produces Kelvin values that are almost the same, 4 shots of varying scenes produced values of 4620, 4621, 4622 and 4626.
So, to sum up my question - why doesn't the Kelvin value produced by selecting the preset in C1 always result in the same number with this camera?
Ian
[edited to correct a typo]
I would have expected that for the same camera selecting the same preset in C1 should produce the same colour temperature.
(I realise that what the Canon S110 thinks is the Kelvin value for daylight will not be the same as what my more serious Nikon D7000 uses - and with the D7000, selecting the "daylight preset in C1 always gives the result 5208 Kelvin.)
As a quick experiment just now I set the S110 camera itself to daylight white balance rather than auto. This produces Kelvin values that are almost the same, 4 shots of varying scenes produced values of 4620, 4621, 4622 and 4626.
So, to sum up my question - why doesn't the Kelvin value produced by selecting the preset in C1 always result in the same number with this camera?
Ian
[edited to correct a typo]
0
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It's correct that you can see different Kelvin values for different camera under the same WB.
We use the values the camera dictates.
So, if a 5d mkII has its daylight preset at 5500 K and a 5D mk III has daylight at 5600, that is as designed, and CO will reflect that.
Remember that different sensors might interpret the same WB in a different way, thus a different Kelvin value is needed to create neutral grey.0 -
[quote="Christian Gruner" wrote:
It's correct that you can see different Kelvin values for different camera under the same WB.
We use the values the camera dictates.
So, if a 5d mkII has its daylight preset at 5500 K and a 5D mk III has daylight at 5600, that is as designed, and CO will reflect that.
Remember that different sensors might interpret the same WB in a different way, thus a different Kelvin value is needed to create neutral grey.
Yes, Christian, I get that bit. That was the point about my comparison with the D7000 and the S110. But my question is why with the same camera (the S110) setting C1 to daylight does not always produce the same Kelvin value. I expected the Canon to differ from the Nikon, but I expected the Canon to always have the same Kelvin value when I selected the daylight preset - but instead it varies.
Ian0 -
Just to be sure, did you set the preset in-camera or in CO ? 0 -
Christian
The camera was set to auto white balance, and that produced Kelvin values that varied from one shot to another, as you might expect. But when processing the shots in Capture One, I set it to daylight. That still results in differing Kelvin values as described in my original post.
(By the way, I have C1 installed on both an iMac and a MacBook Pro, and the same variation occurs on both of them, with this camera.)
Thanks for your help.
Ian0
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